To prevent play from being stopped by excessively storing or lacking balls in an upper or lower ball tank by detecting the over less state, suitable state or over more state of amounts of balls stored in the upper and lower ball tanks and performing display corresponding to the combination of these detected amounts.

For an upper ball stock amount detecting means 8, sensors 8a, 8b and 8c are arranged at vertical three positions on the side face of an upper ball tank 5 on the downstream side of flowing direction of PACHINKO balls, and for a lower ball stock amount detecting means 9, sensors 9a, 9b and 9c are arranged at vertical three positions on the side face of a lower ball tank 6 on the upstream side of flowing direction of PACHINKO balls. Then, a display means 10 is provided at a position for visually confirming a display state from the outside while being exposed on the outer surface of PACHINKO unit equipment 1, and the display operation is performed corresponding to the combination of conditions of the upper and lower ball tanks 5 and 6 received from the upper and lower ball stock amount detecting means 8 and 9 as output signals.